The author states that there is a dearth of systematic empirical investigation into which one of the following?

yckim2180 on May 2, 2021

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Where can we find the reference to the evidence?

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yckim2180 on May 2, 2021

Sorry, I meant reference to the investigation

Emil-Kunkin on September 29, 2022

Hi, while we do not have anything about an investigation, we are explicitly told that there is not enough study of the degree to which harmful pollutants cross borders in violation of international conventional norms. A, while somewhat abstract, reflects this.